The Late Devonian Frasnian–Famennian (F/F) biotic crisis: Insights from C, C and Sr/Sr isotopic systematics

A severe biotic crisis occurred during the Late Devonian Frasnian–Famennian (F/F) transition (± 367 Myr). Here we present δ13Ccarb, δ13Corg and 87Sr / 86Sr isotopic systematics, from identical samples of two sections across F/F boundary in South China, which directly demonstrate large and frequent climatic fluctuations (∼200 kyr) from warming to cooling during the F/F transition. These climate fluctuations are interpreted to have been induced...